The blades that catch the wind and power wind turbines are massive, fibreglass and carbon-composite materials. Each blade can weigh 18 short tons (16 metric tonnes), and in 2030 it is expected that more than 34,000 blades will be replaced each year. That's over 550,000 tonnes of "blade waste" each year. At the moment there is no recycling/reprocessing pathway for the blades as currently manufactured.
This article refers to research currently underway in the US to make blades out of natural cellulose fibers and bio-based plastics derived from soybean, linseed, and other vegetable oils, instead of oil-based polymers.
Via Bert Guevara